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    SubjectRe: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang
    Quoting Lee Schermerhorn (Lee.Schermerhorn@hp.com):
    > On Mon, 2007-08-13 at 15:12 -0500, Serge E. Hallyn wrote:
    > > Quoting Dhaval Giani (dhaval@linux.vnet.ibm.com):
    > > > Hi,
    > > >
    > > > On mounting cpusets using containers, I have been hitting the following
    > > > bug.
    > > >
    > > >
    > > > -----------[ cut here ]------------
    > > > kernel BUG at kernel/cpuset.c:331!
    > <snip>
    > > > CONFIG_HIGHMEM=y
    > > > CONFIG_X86_PAE=y
    > > > # CONFIG_NUMA is not set
    > > > CONFIG_ARCH_POPULATES_NODE_MAP=y
    > > > CONFIG_SELECT_MEMORY_MODEL=y
    > > > CONFIG_FLATMEM_MANUAL=y
    > > > # CONFIG_DISCONTIGMEM_MANUAL is not set
    > > > # CONFIG_SPARSEMEM_MANUAL is not set
    > > > CONFIG_FLATMEM=y
    > > > CONFIG_FLAT_NODE_MEM_MAP=y
    > > > # CONFIG_SPARSEMEM_STATIC is not set
    > > > CONFIG_SPLIT_PTLOCK_CPUS=4
    > > > CONFIG_RESOURCES_64BIT=y
    > > > CONFIG_ZONE_DMA_FLAG=1
    > <snip>
    > >
    > > Yeah, I'm seeing the same thing. Oddly, my node_states[N_NORMAL_MEMORY]
    > > and node_states[N_HIGH_MEMORY] are empty, while node_states[N_ONLINE]
    > > contains my single cpu (on i386 kvm image).
    > >
    > > -serge
    >
    > Yes, you'll definitely hit that BUG if the N_HIGH_MEMORY mask is empty.
    > So far, I can't see how this could be, tho'. __build_all_zonelists()
    > should be called for non-NUMA as well as NUMA. It iterates over "all

    Yup, and it is, and some debug statements insist that
    node_set_state(nid, N_HIGH_MEMORY) is being called for cpu 0,
    and the state is in fact being correctly set.

    So it must get cleared later...

    -serge
    -
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